(19)

(11)

EP 1 339 921 A1

(12)

(43) Date of publication: 03.09.2003 Bulletin 2003/36 (21) Application number: 01991787.1 (22) Date of filing: 03.12.2001

(51) International Patent Classification (IPC)7: E02B 17/02 (86) International application number: PCT/EP0114/279 (87) International publication number: WO 0204/6537 (13.06.2002 Gazette 2002/24)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 05.12.2000 EP 00204340 (71) Applicant: SHELL INTERNATIONALE RESEARCHMAATSCHAPPIJ B.V. 2596 HR Den Haag (NL)	(72) Inventors: MEEK, Harke, Jan NL-2596 HR The Hague (NL) SLIGGERS, Pieter, Gerardus, Frank NL-2288 GD Rijswijk (NL)